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Long-Term Debt Obligations (Details) (USD $)
 3 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Jun. 30, 2014
Revolving credit facility
item
Jun. 25, 2013
Revolving credit facility
Jun. 24, 2013
Revolving credit facility
Jul. 22, 2014
Revolving credit facility
Subsequent events
Jun. 30, 2014
Revolving credit facility
EAS
Jun. 30, 2014
Revolving credit facility
Actual
Jun. 30, 2014
Revolving credit facility
Minimum
Jun. 30, 2014
Revolving credit facility
Minimum
Covenant Requirement
Jun. 30, 2014
Revolving credit facility
Minimum
Actual
Jun. 30, 2014
Revolving credit facility
Maximum
Jun. 30, 2014
Revolving credit facility
Maximum
Through December 31, 2014
Jun. 30, 2014
Revolving credit facility
Maximum
Through December 31, 2015
Jun. 30, 2014
Revolving credit facility
Maximum
Through maturity
Jun. 30, 2014
Revolving credit facility
Maximum
Covenant Requirement
Jun. 30, 2014
Revolving credit facility
Maximum
Actual
Jun. 30, 2014
Revolving credit facility
Base rate
Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: Less than 0.75
Jun. 30, 2014
Revolving credit facility
Base rate
Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 0.75 to 1.50
Jun. 30, 2014
Revolving credit facility
Base rate
Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 1.50 to 2.25
Jun. 30, 2014
Revolving credit facility
Base rate
Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 2.25 or greater
Jun. 30, 2014
Revolving credit facility
Eurodollar rate
Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: Less than 0.75
Jun. 30, 2014
Revolving credit facility
Eurodollar rate
Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 0.75 to 1.50
Jun. 30, 2014
Revolving credit facility
Eurodollar rate
Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 1.50 to 2.25
Jun. 30, 2014
Revolving credit facility
Eurodollar rate
Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 2.25 or greater
Jun. 30, 2014
Notes to former owners
Dec. 31, 2013
Notes to former owners
Long-Term Debt Obligations                                                            
Total debt $ 52,000,000   $ 52,000,000   $ 2,000,000 $ 52,000,000                                               $ 2,000,000
Less - current portion         (2,000,000)                                                  
Total long-term portion of debt 52,000,000   52,000,000                                                      
Borrowing capacity           175,000,000 175,000,000 125,000,000 250,000,000 2,500,000                                        
Outstanding borrowings           52,000,000                                                
Letters of credit amount outstanding           50,600,000                                                
Credit available           72,400,000                                                
Number of interest rate options           2                                                
Additional per annum interest margin added under:                                                            
Variable rate basis                                         Base rate Base rate Base rate Base rate Eurodollar rate Eurodollar rate Eurodollar rate Eurodollar rate    
Additional per annum interest margin (as a percent)                                         0.25% 0.50% 0.75% 1.00% 1.25% 1.50% 1.75% 2.00%    
Weighted average interest rate (as a percent)           3.50%                                             3.30%  
Payments of debt 2,000,000 2,000,000 2,000,000 2,000,000                                                    
Letter of credit fees (as a percent)                       1.25%     2.00%                              
Commitment fees payable on unused portion of the facility (as a percent)                       0.20%     0.35%                              
Principal financial covenants                                                            
Leverage ratio           0.77                   3.00 2.75 2.50                        
Net leverage ratio used to determine exclusion of stock repurchases and the payment of dividends for calculation of the fixed charge coverage ratio                                     1.50                      
Amount of stock repurchases to maintain maximum net leverage ratio                                       25,000,000                    
Net leverage ratio after giving effect to stock repurchases for calculation of the fixed charge coverage ratio                                       1.50                    
Number of quarters of capital expenditures, tax provision, dividends and stock repurchase payments used for calculation of fixed charge coverage ratio           4                                                
Fixed charge coverage ratio                     24.84     2.00                                
Permitted amount of acquisitions per transaction                             20,000,000                              
Aggregate purchase price of current acquisition and acquisitions in the preceding 12 month period for determining permitted amount of acquisition per transaction                             $ 50,000,000                              
Net leverage ratio used as basis for other restrictions                         2.00